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Just reading the latest copy of Street Machine mag (march 08) they have an interesting article on ecotec development, specifically in relation to the COME twin TB manifolds for the ecotec.
on page 104 there is a great side by side pic of the standard plenum Vs the COME plenum. it's plainly obvious that the COME plenum has longer runners and a large increase in volume. there is a dyno graph of comparison between the COME manifold and standard (fully ported manifold) manifold. the come manifold outperforms the standard manifold except for a short window (between 3600rpm to 4600rpm) and maintains and increases torque through to 5500rpm.
for those not willing to spend $1750 on a COME manifold, i suggest the next best option is the MACE manifold insulator. it's a bakerlite (spelling???) to increase runner length and reduce plenum heat (bakerlite is a heat resistant product). COLD AIR INTAKE MANIFOLD INSULATOR FOR HOLDEN VS-VY ECO - eBay Air Filters, Induction Kits, Performance Parts, Car Parts, Accessories, Cars, Bikes, Boats. (end time 13-Mar-08 22:37:22 AEDST)
and a MACE plenum spacer to increase plenum volume PERFORMANCE PLENUM/MANIFOLD SPACER! Holden V6 VS-VY - eBay Engine Modifications, Performance Parts, Car Parts, Accessories, Cars, Bikes, Boats. (end time 10-Mar-08 22:54:18 AEDST)
using these 2 products gets you a poor mans COME manifold.:yeah::thumbsup:
just a note of interest. on page 103 there is a pic of there ecotec engine on there engine dyno, you'll note they are using a VNs1 style ignition pack
other people have used the insulator/spacer with good results so it seems to be a proven product and i think the plenum spacer is given considering how many threads i have seen over the years with people experimenting with this exact mod
on page 104 there is a great side by side pic of the standard plenum Vs the COME plenum. it's plainly obvious that the COME plenum has longer runners and a large increase in volume. there is a dyno graph of comparison between the COME manifold and standard (fully ported manifold) manifold. the come manifold outperforms the standard manifold except for a short window (between 3600rpm to 4600rpm) and maintains and increases torque through to 5500rpm.
for those not willing to spend $1750 on a COME manifold, i suggest the next best option is the MACE manifold insulator. it's a bakerlite (spelling???) to increase runner length and reduce plenum heat (bakerlite is a heat resistant product). COLD AIR INTAKE MANIFOLD INSULATOR FOR HOLDEN VS-VY ECO - eBay Air Filters, Induction Kits, Performance Parts, Car Parts, Accessories, Cars, Bikes, Boats. (end time 13-Mar-08 22:37:22 AEDST)
and a MACE plenum spacer to increase plenum volume PERFORMANCE PLENUM/MANIFOLD SPACER! Holden V6 VS-VY - eBay Engine Modifications, Performance Parts, Car Parts, Accessories, Cars, Bikes, Boats. (end time 10-Mar-08 22:54:18 AEDST)
using these 2 products gets you a poor mans COME manifold.:yeah::thumbsup:
just a note of interest. on page 103 there is a pic of there ecotec engine on there engine dyno, you'll note they are using a VNs1 style ignition pack
other people have used the insulator/spacer with good results so it seems to be a proven product and i think the plenum spacer is given considering how many threads i have seen over the years with people experimenting with this exact mod
